IMHO you will never recapture your $ on an upgrade relatively speaking. There is too much handwaving about receipts, upgrade stickers, how can I be sure, when it comes time to unload. I prefer selling what you have and getting the cash best deal from the dealer on the 335 or a used one on Agon. Besides, the .5 isn't all the way to a 5 sonically, according to the press.
